问Java AES/GCM/NoPadding算法到C#的转换

EN

package ffsd;

import java.security.MessageDigest;
import java.util.Arrays;
import java.util.Base64;
import javax.crypto.Cipher;
import javax.crypto.spec.GCMParameterSpec;
import javax.crypto.spec.SecretKeySpec;

public class GatewayEncryptUtil {
  public static String encrypt(String plainText, String key) throws Exception {
    return new String(Base64.getEncoder().encode(doCrypt(plainText.getBytes(), 1, key)));
  }
  
  public static byte[] doCrypt(byte[] inputText, int operation, String key) throws Exception {
    MessageDigest mDigest = MessageDigest.getInstance("SHA-512");
    byte[] secretKey = key.getBytes();
    byte[] digestSeed = mDigest.digest(secretKey);
    byte[] hashKey = Arrays.copyOf(digestSeed, 16);
    
    Cipher cipher = Cipher.getInstance("AES/GCM/NoPadding");
    SecretKeySpec skspec = new SecretKeySpec(hashKey, "AES");
    String cipherKey = new String(secretKey);
    GCMParameterSpec gcmParams = new GCMParameterSpec(128, cipherKey.substring(0, 16).getBytes());
    cipher.init(operation, skspec, gcmParams);
    return cipher.doFinal(inputText);
  }
  
  public static void main(String[] args) {
    try {
      System.out.println(encrypt("Password", "1234567890123456"));
    } catch (Exception e) {
      e.printStackTrace();
    } 
  }
}

using System;
using System.Security.Cryptography;
using System.Text;

namespace ConsoleApp3
{
    class Program
    {
        static void Main(string[] args)
        {
            string inputText = "Password";
            string msgId = "1234567890123456";

            byte[] hashKey;
            byte[] secretKey = Encoding.ASCII.GetBytes(msgId);

            using (var hasher = SHA512.Create())
            {
                byte[] digestSeed = hasher.ComputeHash(secretKey);
                hashKey = new byte[16];
                Array.Copy(digestSeed, hashKey, hashKey.Length);
            }

            using (var aesGcm = new AesGcm(hashKey))
            {
                byte[] nonce = new byte[AesGcm.NonceByteSizes.MaxSize];
                byte[] plainText = Encoding.ASCII.GetBytes(inputText);
                byte[] authTag = new byte[AesGcm.TagByteSizes.MaxSize];
                byte[] cipherText = new byte[plainText.Length];

                aesGcm.Encrypt(nonce, plainText, cipherText, authTag);
                string cipherTextBase64 = Convert.ToBase64String(cipherText);
                string authTagBase64 = Convert.ToBase64String(authTag);

                Console.WriteLine(cipherTextBase64);
                Console.WriteLine(authTagBase64);
            }
        }
    }
}